ERC20 智能合约信息

流程如下：

Solidity(ERC20.sol) –(solc)–> ABI(ERC20.abi) –(abigen)–> Go Package(erc20.go)

# 下载 solc
wget https://github.com/ethereum/solidity/releases/download/v0.8.21/solc-static-linux
chmod +x solc-static-linux
mv solc-static-linux /usr/bin/solc

# 下载 ERC20.sol
git clone https://github.com/OpenZeppelin/openzeppelin-contracts.git
# 构建 abi
solc --abi ~/src/OpenZeppelin/openzeppelin-contracts/contracts/token/ERC20/ERC20.sol --base-path ~/src/OpenZeppelin/openzeppelin-contracts --output-dir ./

# 安装 abigen
git clone https://github.com/ethereum/go-ethereum.git 
cd go-ethereum
make && make all
ll build/bin/

~/src/ethereum/go-ethereum/build/bin/abigen --abi=ERC20.abi --pkg=token --out=erc20.go

erc20.go

// Code generated - DO NOT EDIT.
// This file is a generated binding and any manual changes will be lost.

package token

import (
    "errors"
    "math/big"
    "strings"

    ethereum "github.com/ethereum/go-ethereum"
    "github.com/ethereum/go-ethereum/accounts/abi"
    "github.com/ethereum/go-ethereum/accounts/abi/bind"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/event"
)

// Reference imports to suppress errors if they are not otherwise used.
var (
    _ = errors.New
    _ = big.NewInt
    _ = strings.NewReader
    _ = ethereum.NotFound
    _ = bind.Bind
    _ = common.Big1
    _ = types.BloomLookup
    _ = event.NewSubscription
    _ = abi.ConvertType
)

// TokenMetaData contains all meta data concerning the Token contract.
var TokenMetaData = &bind.MetaData{
    ABI: "[{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"allowance\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"needed\",\"type\":\"uint256\"}],\"name\":\"ERC20InsufficientAllowance\",\"type\":\"error\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"sender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"balance\",\"type\":\"uint256\"},{\"internalType\":\"uint256\",\"name\":\"needed\",\"type\":\"uint256\"}],\"name\":\"ERC20InsufficientBalance\",\"type\":\"error\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"approver\",\"type\":\"address\"}],\"name\":\"ERC20InvalidApprover\",\"type\":\"error\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"receiver\",\"type\":\"address\"}],\"name\":\"ERC20InvalidReceiver\",\"type\":\"error\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"sender\",\"type\":\"address\"}],\"name\":\"ERC20InvalidSender\",\"type\":\"error\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"ERC20InvalidSpender\",\"type\":\"error\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Approval\",\"type\":\"event\"},{\"anonymous\":false,\"inputs\":[{\"indexed\":true,\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"indexed\":true,\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"indexed\":false,\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"Transfer\",\"type\":\"event\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"owner\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"}],\"name\":\"allowance\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"spender\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"approve\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"account\",\"type\":\"address\"}],\"name\":\"balanceOf\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"decimals\",\"outputs\":[{\"internalType\":\"uint8\",\"name\":\"\",\"type\":\"uint8\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"name\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"symbol\",\"outputs\":[{\"internalType\":\"string\",\"name\":\"\",\"type\":\"string\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[],\"name\":\"totalSupply\",\"outputs\":[{\"internalType\":\"uint256\",\"name\":\"\",\"type\":\"uint256\"}],\"stateMutability\":\"view\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transfer\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"},{\"inputs\":[{\"internalType\":\"address\",\"name\":\"from\",\"type\":\"address\"},{\"internalType\":\"address\",\"name\":\"to\",\"type\":\"address\"},{\"internalType\":\"uint256\",\"name\":\"value\",\"type\":\"uint256\"}],\"name\":\"transferFrom\",\"outputs\":[{\"internalType\":\"bool\",\"name\":\"\",\"type\":\"bool\"}],\"stateMutability\":\"nonpayable\",\"type\":\"function\"}]",
}

// TokenABI is the input ABI used to generate the binding from.
// Deprecated: Use TokenMetaData.ABI instead.
var TokenABI = TokenMetaData.ABI

// Token is an auto generated Go binding around an Ethereum contract.
type Token struct {
    TokenCaller     // Read-only binding to the contract
    TokenTransactor // Write-only binding to the contract
    TokenFilterer   // Log filterer for contract events
}

// TokenCaller is an auto generated read-only Go binding around an Ethereum contract.
type TokenCaller struct {
    contract *bind.BoundContract // Generic contract wrapper for the low level calls
}

// TokenTransactor is an auto generated write-only Go binding around an Ethereum contract.
type TokenTransactor struct {
    contract *bind.BoundContract // Generic contract wrapper for the low level calls
}

// TokenFilterer is an auto generated log filtering Go binding around an Ethereum contract events.
type TokenFilterer struct {
    contract *bind.BoundContract // Generic contract wrapper for the low level calls
}

// TokenSession is an auto generated Go binding around an Ethereum contract,
// with pre-set call and transact options.
type TokenSession struct {
    Contract     *Token            // Generic contract binding to set the session for
    CallOpts     bind.CallOpts     // Call options to use throughout this session
    TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
}

// TokenCallerSession is an auto generated read-only Go binding around an Ethereum contract,
// with pre-set call options.
type TokenCallerSession struct {
    Contract *TokenCaller  // Generic contract caller binding to set the session for
    CallOpts bind.CallOpts // Call options to use throughout this session
}

// TokenTransactorSession is an auto generated write-only Go binding around an Ethereum contract,
// with pre-set transact options.
type TokenTransactorSession struct {
    Contract     *TokenTransactor  // Generic contract transactor binding to set the session for
    TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
}

// TokenRaw is an auto generated low-level Go binding around an Ethereum contract.
type TokenRaw struct {
    Contract *Token // Generic contract binding to access the raw methods on
}

// TokenCallerRaw is an auto generated low-level read-only Go binding around an Ethereum contract.
type TokenCallerRaw struct {
    Contract *TokenCaller // Generic read-only contract binding to access the raw methods on
}

// TokenTransactorRaw is an auto generated low-level write-only Go binding around an Ethereum contract.
type TokenTransactorRaw struct {
    Contract *TokenTransactor // Generic write-only contract binding to access the raw methods on
}

// NewToken creates a new instance of Token, bound to a specific deployed contract.
func NewToken(address common.Address, backend bind.ContractBackend) (*Token, error) {
    contract, err := bindToken(address, backend, backend, backend)
    if err != nil {
        return nil, err
    }
    return &Token{TokenCaller: TokenCaller{contract: contract}, TokenTransactor: TokenTransactor{contract: contract}, TokenFilterer: TokenFilterer{contract: contract}}, nil
}

// NewTokenCaller creates a new read-only instance of Token, bound to a specific deployed contract.
func NewTokenCaller(address common.Address, caller bind.ContractCaller) (*TokenCaller, error) {
    contract, err := bindToken(address, caller, nil, nil)
    if err != nil {
        return nil, err
    }
    return &TokenCaller{contract: contract}, nil
}

// NewTokenTransactor creates a new write-only instance of Token, bound to a specific deployed contract.
func NewTokenTransactor(address common.Address, transactor bind.ContractTransactor) (*TokenTransactor, error) {
    contract, err := bindToken(address, nil, transactor, nil)
    if err != nil {
        return nil, err
    }
    return &TokenTransactor{contract: contract}, nil
}

// NewTokenFilterer creates a new log filterer instance of Token, bound to a specific deployed contract.
func NewTokenFilterer(address common.Address, filterer bind.ContractFilterer) (*TokenFilterer, error) {
    contract, err := bindToken(address, nil, nil, filterer)
    if err != nil {
        return nil, err
    }
    return &TokenFilterer{contract: contract}, nil
}

// bindToken binds a generic wrapper to an already deployed contract.
func bindToken(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor, filterer bind.ContractFilterer) (*bind.BoundContract, error) {
    parsed, err := TokenMetaData.GetAbi()
    if err != nil {
        return nil, err
    }
    return bind.NewBoundContract(address, *parsed, caller, transactor, filterer), nil
}

// Call invokes the (constant) contract method with params as input values and
// sets the output to result. The result type might be a single field for simple
// returns, a slice of interfaces for anonymous returns and a struct for named
// returns.
func (_Token *TokenRaw) Call(opts *bind.CallOpts, result *[]interface{}, method string, params ...interface{}) error {
    return _Token.Contract.TokenCaller.contract.Call(opts, result, method, params...)
}

// Transfer initiates a plain transaction to move funds to the contract, calling
// its default method if one is available.
func (_Token *TokenRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
    return _Token.Contract.TokenTransactor.contract.Transfer(opts)
}

// Transact invokes the (paid) contract method with params as input values.
func (_Token *TokenRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
    return _Token.Contract.TokenTransactor.contract.Transact(opts, method, params...)
}

// Call invokes the (constant) contract method with params as input values and
// sets the output to result. The result type might be a single field for simple
// returns, a slice of interfaces for anonymous returns and a struct for named
// returns.
func (_Token *TokenCallerRaw) Call(opts *bind.CallOpts, result *[]interface{}, method string, params ...interface{}) error {
    return _Token.Contract.contract.Call(opts, result, method, params...)
}

// Transfer initiates a plain transaction to move funds to the contract, calling
// its default method if one is available.
func (_Token *TokenTransactorRaw) Transfer(opts *bind.TransactOpts) (*types.Transaction, error) {
    return _Token.Contract.contract.Transfer(opts)
}

// Transact invokes the (paid) contract method with params as input values.
func (_Token *TokenTransactorRaw) Transact(opts *bind.TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
    return _Token.Contract.contract.Transact(opts, method, params...)
}

// Allowance is a free data retrieval call binding the contract method 0xdd62ed3e.
//
// Solidity: function allowance(address owner, address spender) view returns(uint256)
func (_Token *TokenCaller) Allowance(opts *bind.CallOpts, owner common.Address, spender common.Address) (*big.Int, error) {
    var out []interface{}
    err := _Token.contract.Call(opts, &out, "allowance", owner, spender)

    if err != nil {
        return *new(*big.Int), err
    }

    out0 := *abi.ConvertType(out[0], new(*big.Int)).(**big.Int)

    return out0, err

}

// Allowance is a free data retrieval call binding the contract method 0xdd62ed3e.
//
// Solidity: function allowance(address owner, address spender) view returns(uint256)
func (_Token *TokenSession) Allowance(owner common.Address, spender common.Address) (*big.Int, error) {
    return _Token.Contract.Allowance(&_Token.CallOpts, owner, spender)
}

// Allowance is a free data retrieval call binding the contract method 0xdd62ed3e.
//
// Solidity: function allowance(address owner, address spender) view returns(uint256)
func (_Token *TokenCallerSession) Allowance(owner common.Address, spender common.Address) (*big.Int, error) {
    return _Token.Contract.Allowance(&_Token.CallOpts, owner, spender)
}

// BalanceOf is a free data retrieval call binding the contract method 0x70a08231.
//
// Solidity: function balanceOf(address account) view returns(uint256)
func (_Token *TokenCaller) BalanceOf(opts *bind.CallOpts, account common.Address) (*big.Int, error) {
    var out []interface{}
    err := _Token.contract.Call(opts, &out, "balanceOf", account)

    if err != nil {
        return *new(*big.Int), err
    }

    out0 := *abi.ConvertType(out[0], new(*big.Int)).(**big.Int)

    return out0, err

}

// BalanceOf is a free data retrieval call binding the contract method 0x70a08231.
//
// Solidity: function balanceOf(address account) view returns(uint256)
func (_Token *TokenSession) BalanceOf(account common.Address) (*big.Int, error) {
    return _Token.Contract.BalanceOf(&_Token.CallOpts, account)
}

// BalanceOf is a free data retrieval call binding the contract method 0x70a08231.
//
// Solidity: function balanceOf(address account) view returns(uint256)
func (_Token *TokenCallerSession) BalanceOf(account common.Address) (*big.Int, error) {
    return _Token.Contract.BalanceOf(&_Token.CallOpts, account)
}

// Decimals is a free data retrieval call binding the contract method 0x313ce567.
//
// Solidity: function decimals() view returns(uint8)
func (_Token *TokenCaller) Decimals(opts *bind.CallOpts) (uint8, error) {
    var out []interface{}
    err := _Token.contract.Call(opts, &out, "decimals")

    if err != nil {
        return *new(uint8), err
    }

    out0 := *abi.ConvertType(out[0], new(uint8)).(*uint8)

    return out0, err

}

// Decimals is a free data retrieval call binding the contract method 0x313ce567.
//
// Solidity: function decimals() view returns(uint8)
func (_Token *TokenSession) Decimals() (uint8, error) {
    return _Token.Contract.Decimals(&_Token.CallOpts)
}

// Decimals is a free data retrieval call binding the contract method 0x313ce567.
//
// Solidity: function decimals() view returns(uint8)
func (_Token *TokenCallerSession) Decimals() (uint8, error) {
    return _Token.Contract.Decimals(&_Token.CallOpts)
}

// Name is a free data retrieval call binding the contract method 0x06fdde03.
//
// Solidity: function name() view returns(string)
func (_Token *TokenCaller) Name(opts *bind.CallOpts) (string, error) {
    var out []interface{}
    err := _Token.contract.Call(opts, &out, "name")

    if err != nil {
        return *new(string), err
    }

    out0 := *abi.ConvertType(out[0], new(string)).(*string)

    return out0, err

}

// Name is a free data retrieval call binding the contract method 0x06fdde03.
//
// Solidity: function name() view returns(string)
func (_Token *TokenSession) Name() (string, error) {
    return _Token.Contract.Name(&_Token.CallOpts)
}

// Name is a free data retrieval call binding the contract method 0x06fdde03.
//
// Solidity: function name() view returns(string)
func (_Token *TokenCallerSession) Name() (string, error) {
    return _Token.Contract.Name(&_Token.CallOpts)
}

// Symbol is a free data retrieval call binding the contract method 0x95d89b41.
//
// Solidity: function symbol() view returns(string)
func (_Token *TokenCaller) Symbol(opts *bind.CallOpts) (string, error) {
    var out []interface{}
    err := _Token.contract.Call(opts, &out, "symbol")

    if err != nil {
        return *new(string), err
    }

    out0 := *abi.ConvertType(out[0], new(string)).(*string)

    return out0, err

}

// Symbol is a free data retrieval call binding the contract method 0x95d89b41.
//
// Solidity: function symbol() view returns(string)
func (_Token *TokenSession) Symbol() (string, error) {
    return _Token.Contract.Symbol(&_Token.CallOpts)
}

// Symbol is a free data retrieval call binding the contract method 0x95d89b41.
//
// Solidity: function symbol() view returns(string)
func (_Token *TokenCallerSession) Symbol() (string, error) {
    return _Token.Contract.Symbol(&_Token.CallOpts)
}

// TotalSupply is a free data retrieval call binding the contract method 0x18160ddd.
//
// Solidity: function totalSupply() view returns(uint256)
func (_Token *TokenCaller) TotalSupply(opts *bind.CallOpts) (*big.Int, error) {
    var out []interface{}
    err := _Token.contract.Call(opts, &out, "totalSupply")

    if err != nil {
        return *new(*big.Int), err
    }

    out0 := *abi.ConvertType(out[0], new(*big.Int)).(**big.Int)

    return out0, err

}

// TotalSupply is a free data retrieval call binding the contract method 0x18160ddd.
//
// Solidity: function totalSupply() view returns(uint256)
func (_Token *TokenSession) TotalSupply() (*big.Int, error) {
    return _Token.Contract.TotalSupply(&_Token.CallOpts)
}

// TotalSupply is a free data retrieval call binding the contract method 0x18160ddd.
//
// Solidity: function totalSupply() view returns(uint256)
func (_Token *TokenCallerSession) TotalSupply() (*big.Int, error) {
    return _Token.Contract.TotalSupply(&_Token.CallOpts)
}

// Approve is a paid mutator transaction binding the contract method 0x095ea7b3.
//
// Solidity: function approve(address spender, uint256 value) returns(bool)
func (_Token *TokenTransactor) Approve(opts *bind.TransactOpts, spender common.Address, value *big.Int) (*types.Transaction, error) {
    return _Token.contract.Transact(opts, "approve", spender, value)
}

// Approve is a paid mutator transaction binding the contract method 0x095ea7b3.
//
// Solidity: function approve(address spender, uint256 value) returns(bool)
func (_Token *TokenSession) Approve(spender common.Address, value *big.Int) (*types.Transaction, error) {
    return _Token.Contract.Approve(&_Token.TransactOpts, spender, value)
}

// Approve is a paid mutator transaction binding the contract method 0x095ea7b3.
//
// Solidity: function approve(address spender, uint256 value) returns(bool)
func (_Token *TokenTransactorSession) Approve(spender common.Address, value *big.Int) (*types.Transaction, error) {
    return _Token.Contract.Approve(&_Token.TransactOpts, spender, value)
}

// Transfer is a paid mutator transaction binding the contract method 0xa9059cbb.
//
// Solidity: function transfer(address to, uint256 value) returns(bool)
func (_Token *TokenTransactor) Transfer(opts *bind.TransactOpts, to common.Address, value *big.Int) (*types.Transaction, error) {
    return _Token.contract.Transact(opts, "transfer", to, value)
}

// Transfer is a paid mutator transaction binding the contract method 0xa9059cbb.
//
// Solidity: function transfer(address to, uint256 value) returns(bool)
func (_Token *TokenSession) Transfer(to common.Address, value *big.Int) (*types.Transaction, error) {
    return _Token.Contract.Transfer(&_Token.TransactOpts, to, value)
}

// Transfer is a paid mutator transaction binding the contract method 0xa9059cbb.
//
// Solidity: function transfer(address to, uint256 value) returns(bool)
func (_Token *TokenTransactorSession) Transfer(to common.Address, value *big.Int) (*types.Transaction, error) {
    return _Token.Contract.Transfer(&_Token.TransactOpts, to, value)
}

// TransferFrom is a paid mutator transaction binding the contract method 0x23b872dd.
//
// Solidity: function transferFrom(address from, address to, uint256 value) returns(bool)
func (_Token *TokenTransactor) TransferFrom(opts *bind.TransactOpts, from common.Address, to common.Address, value *big.Int) (*types.Transaction, error) {
    return _Token.contract.Transact(opts, "transferFrom", from, to, value)
}

// TransferFrom is a paid mutator transaction binding the contract method 0x23b872dd.
//
// Solidity: function transferFrom(address from, address to, uint256 value) returns(bool)
func (_Token *TokenSession) TransferFrom(from common.Address, to common.Address, value *big.Int) (*types.Transaction, error) {
    return _Token.Contract.TransferFrom(&_Token.TransactOpts, from, to, value)
}

// TransferFrom is a paid mutator transaction binding the contract method 0x23b872dd.
//
// Solidity: function transferFrom(address from, address to, uint256 value) returns(bool)
func (_Token *TokenTransactorSession) TransferFrom(from common.Address, to common.Address, value *big.Int) (*types.Transaction, error) {
    return _Token.Contract.TransferFrom(&_Token.TransactOpts, from, to, value)
}

// TokenApprovalIterator is returned from FilterApproval and is used to iterate over the raw logs and unpacked data for Approval events raised by the Token contract.
type TokenApprovalIterator struct {
    Event *TokenApproval // Event containing the contract specifics and raw log

    contract *bind.BoundContract // Generic contract to use for unpacking event data
    event    string              // Event name to use for unpacking event data

    logs chan types.Log        // Log channel receiving the found contract events
    sub  ethereum.Subscription // Subscription for errors, completion and termination
    done bool                  // Whether the subscription completed delivering logs
    fail error                 // Occurred error to stop iteration
}

// Next advances the iterator to the subsequent event, returning whether there
// are any more events found. In case of a retrieval or parsing error, false is
// returned and Error() can be queried for the exact failure.
func (it *TokenApprovalIterator) Next() bool {
    // If the iterator failed, stop iterating
    if it.fail != nil {
        return false
    }
    // If the iterator completed, deliver directly whatever's available
    if it.done {
        select {
        case log := <-it.logs:
            it.Event = new(TokenApproval)
            if err := it.contract.UnpackLog(it.Event, it.event, log); err != nil {
                it.fail = err
                return false
            }
            it.Event.Raw = log
            return true

        default:
            return false
        }
    }
    // Iterator still in progress, wait for either a data or an error event
    select {
    case log := <-it.logs:
        it.Event = new(TokenApproval)
        if err := it.contract.UnpackLog(it.Event, it.event, log); err != nil {
            it.fail = err
            return false
        }
        it.Event.Raw = log
        return true

    case err := <-it.sub.Err():
        it.done = true
        it.fail = err
        return it.Next()
    }
}

// Error returns any retrieval or parsing error occurred during filtering.
func (it *TokenApprovalIterator) Error() error {
    return it.fail
}

// Close terminates the iteration process, releasing any pending underlying
// resources.
func (it *TokenApprovalIterator) Close() error {
    it.sub.Unsubscribe()
    return nil
}

// TokenApproval represents a Approval event raised by the Token contract.
type TokenApproval struct {
    Owner   common.Address
    Spender common.Address
    Value   *big.Int
    Raw     types.Log // Blockchain specific contextual infos
}

// FilterApproval is a free log retrieval operation binding the contract event 0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925.
//
// Solidity: event Approval(address indexed owner, address indexed spender, uint256 value)
func (_Token *TokenFilterer) FilterApproval(opts *bind.FilterOpts, owner []common.Address, spender []common.Address) (*TokenApprovalIterator, error) {

    var ownerRule []interface{}
    for _, ownerItem := range owner {
        ownerRule = append(ownerRule, ownerItem)
    }
    var spenderRule []interface{}
    for _, spenderItem := range spender {
        spenderRule = append(spenderRule, spenderItem)
    }

    logs, sub, err := _Token.contract.FilterLogs(opts, "Approval", ownerRule, spenderRule)
    if err != nil {
        return nil, err
    }
    return &TokenApprovalIterator{contract: _Token.contract, event: "Approval", logs: logs, sub: sub}, nil
}

// WatchApproval is a free log subscription operation binding the contract event 0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925.
//
// Solidity: event Approval(address indexed owner, address indexed spender, uint256 value)
func (_Token *TokenFilterer) WatchApproval(opts *bind.WatchOpts, sink chan<- *TokenApproval, owner []common.Address, spender []common.Address) (event.Subscription, error) {

    var ownerRule []interface{}
    for _, ownerItem := range owner {
        ownerRule = append(ownerRule, ownerItem)
    }
    var spenderRule []interface{}
    for _, spenderItem := range spender {
        spenderRule = append(spenderRule, spenderItem)
    }

    logs, sub, err := _Token.contract.WatchLogs(opts, "Approval", ownerRule, spenderRule)
    if err != nil {
        return nil, err
    }
    return event.NewSubscription(func(quit <-chan struct{}) error {
        defer sub.Unsubscribe()
        for {
            select {
            case log := <-logs:
                // New log arrived, parse the event and forward to the user
                event := new(TokenApproval)
                if err := _Token.contract.UnpackLog(event, "Approval", log); err != nil {
                    return err
                }
                event.Raw = log

                select {
                case sink <- event:
                case err := <-sub.Err():
                    return err
                case <-quit:
                    return nil
                }
            case err := <-sub.Err():
                return err
            case <-quit:
                return nil
            }
        }
    }), nil
}

// ParseApproval is a log parse operation binding the contract event 0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925.
//
// Solidity: event Approval(address indexed owner, address indexed spender, uint256 value)
func (_Token *TokenFilterer) ParseApproval(log types.Log) (*TokenApproval, error) {
    event := new(TokenApproval)
    if err := _Token.contract.UnpackLog(event, "Approval", log); err != nil {
        return nil, err
    }
    event.Raw = log
    return event, nil
}

// TokenTransferIterator is returned from FilterTransfer and is used to iterate over the raw logs and unpacked data for Transfer events raised by the Token contract.
type TokenTransferIterator struct {
    Event *TokenTransfer // Event containing the contract specifics and raw log

    contract *bind.BoundContract // Generic contract to use for unpacking event data
    event    string              // Event name to use for unpacking event data

    logs chan types.Log        // Log channel receiving the found contract events
    sub  ethereum.Subscription // Subscription for errors, completion and termination
    done bool                  // Whether the subscription completed delivering logs
    fail error                 // Occurred error to stop iteration
}

// Next advances the iterator to the subsequent event, returning whether there
// are any more events found. In case of a retrieval or parsing error, false is
// returned and Error() can be queried for the exact failure.
func (it *TokenTransferIterator) Next() bool {
    // If the iterator failed, stop iterating
    if it.fail != nil {
        return false
    }
    // If the iterator completed, deliver directly whatever's available
    if it.done {
        select {
        case log := <-it.logs:
            it.Event = new(TokenTransfer)
            if err := it.contract.UnpackLog(it.Event, it.event, log); err != nil {
                it.fail = err
                return false
            }
            it.Event.Raw = log
            return true

        default:
            return false
        }
    }
    // Iterator still in progress, wait for either a data or an error event
    select {
    case log := <-it.logs:
        it.Event = new(TokenTransfer)
        if err := it.contract.UnpackLog(it.Event, it.event, log); err != nil {
            it.fail = err
            return false
        }
        it.Event.Raw = log
        return true

    case err := <-it.sub.Err():
        it.done = true
        it.fail = err
        return it.Next()
    }
}

// Error returns any retrieval or parsing error occurred during filtering.
func (it *TokenTransferIterator) Error() error {
    return it.fail
}

// Close terminates the iteration process, releasing any pending underlying
// resources.
func (it *TokenTransferIterator) Close() error {
    it.sub.Unsubscribe()
    return nil
}

// TokenTransfer represents a Transfer event raised by the Token contract.
type TokenTransfer struct {
    From  common.Address
    To    common.Address
    Value *big.Int
    Raw   types.Log // Blockchain specific contextual infos
}

// FilterTransfer is a free log retrieval operation binding the contract event 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef.
//
// Solidity: event Transfer(address indexed from, address indexed to, uint256 value)
func (_Token *TokenFilterer) FilterTransfer(opts *bind.FilterOpts, from []common.Address, to []common.Address) (*TokenTransferIterator, error) {

    var fromRule []interface{}
    for _, fromItem := range from {
        fromRule = append(fromRule, fromItem)
    }
    var toRule []interface{}
    for _, toItem := range to {
        toRule = append(toRule, toItem)
    }

    logs, sub, err := _Token.contract.FilterLogs(opts, "Transfer", fromRule, toRule)
    if err != nil {
        return nil, err
    }
    return &TokenTransferIterator{contract: _Token.contract, event: "Transfer", logs: logs, sub: sub}, nil
}

// WatchTransfer is a free log subscription operation binding the contract event 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef.
//
// Solidity: event Transfer(address indexed from, address indexed to, uint256 value)
func (_Token *TokenFilterer) WatchTransfer(opts *bind.WatchOpts, sink chan<- *TokenTransfer, from []common.Address, to []common.Address) (event.Subscription, error) {

    var fromRule []interface{}
    for _, fromItem := range from {
        fromRule = append(fromRule, fromItem)
    }
    var toRule []interface{}
    for _, toItem := range to {
        toRule = append(toRule, toItem)
    }

    logs, sub, err := _Token.contract.WatchLogs(opts, "Transfer", fromRule, toRule)
    if err != nil {
        return nil, err
    }
    return event.NewSubscription(func(quit <-chan struct{}) error {
        defer sub.Unsubscribe()
        for {
            select {
            case log := <-logs:
                // New log arrived, parse the event and forward to the user
                event := new(TokenTransfer)
                if err := _Token.contract.UnpackLog(event, "Transfer", log); err != nil {
                    return err
                }
                event.Raw = log

                select {
                case sink <- event:
                case err := <-sub.Err():
                    return err
                case <-quit:
                    return nil
                }
            case err := <-sub.Err():
                return err
            case <-quit:
                return nil
            }
        }
    }), nil
}

// ParseTransfer is a log parse operation binding the contract event 0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef.
//
// Solidity: event Transfer(address indexed from, address indexed to, uint256 value)
func (_Token *TokenFilterer) ParseTransfer(log types.Log) (*TokenTransfer, error) {
    event := new(TokenTransfer)
    if err := _Token.contract.UnpackLog(event, "Transfer", log); err != nil {
        return nil, err
    }
    event.Raw = log
    return event, nil
}